EP 0253454 A1 19880120 - Process for the removal of heavy metals from acid, phosphate-containing aqueous media.
Title (en)
Process for the removal of heavy metals from acid, phosphate-containing aqueous media.
Title (de)
Verfahren zur Beseitigung von Schwermetallen aus wässrigen, sauren, Phosphat enthaltenden Medien.
Title (fr)
Procédé d'élimination de métaux lourds à partir de milieux aqueux acides contenant du phosphate.
Publication
Application
Priority
NL 8601846 A 19860715
Abstract (en)
A process for the removal of heavy metals from an acid phosphate containing, liquid medium in which process a precipitate containing heavy metals is formed and is subsequently separated and wherein at least one of the two additives a) sulphate ions and b) calcium ions is added to the phosphate-containing, liquid medium under such conditions that a calcium sulphate anhydride-containing precipitate is formed.
IPC 1-7
IPC 8 full level
A62D 3/00 (2006.01); A62D 3/33 (2007.01); C01B 25/226 (2006.01); C01B 25/229 (2006.01); C01B 25/238 (2006.01); C01F 11/46 (2006.01); C05B 11/04 (2006.01); A62D 101/24 (2007.01); A62D 101/43 (2007.01)
CPC (source: EP US)
A62D 3/33 (2013.01 - EP US); C01B 25/226 (2013.01 - EP US); C01B 25/2295 (2013.01 - EP US); C01B 25/238 (2013.01 - EP US); C01F 11/46 (2013.01 - EP US); C05B 11/04 (2013.01 - EP US); A62D 2101/24 (2013.01 - EP US); A62D 2101/43 (2013.01 - EP US)
Citation (search report)
- [A] WO 8002418 A1 19801113 - BOLIDEN AB [SE], et al
- [A] GB 2082558 A 19820310 - CENTRAL GLASS CO LTD
- [A] US 1601208 A 19260928 - GERBER ARTHUR B
- [A] CHEMICAL ABSTRACTS, vol. 104, no. 8, February 1986,page 123, abstract no.52906k, Columbus, Ohio, US; K. WETERINGS et al.: "A clean phosphoric acid process", & CHEM. MAG. (RIJSWIJK, NETH.) 1984, (SEPT.), 473-4, 493
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IT LI NL SE
DOCDB simple family (publication)
EP 0253454 A1 19880120; EP 0253454 B1 19901114; AT E58358 T1 19901115; CA 1327113 C 19940222; DE 3766173 D1 19901220; ES 2019372 B3 19910616; FI 82827 B 19910115; FI 82827 C 19910425; FI 873107 A0 19870714; FI 873107 A 19880116; GR 3001466 T3 19921008; IL 83181 A0 19871231; IL 83181 A 19910415; MA 21033 A1 19880401; NL 8601846 A 19880201; TN SN87088 A1 19900101; US 4822582 A 19890418; ZA 875147 B 19880330
DOCDB simple family (application)
EP 87201356 A 19870714; AT 87201356 T 19870714; CA 541862 A 19870713; DE 3766173 T 19870714; ES 87201356 T 19870714; FI 873107 A 19870714; GR 910400176 T 19910211; IL 8318187 A 19870714; MA 21270 A 19870713; NL 8601846 A 19860715; TN SN87088 A 19870715; US 6951287 A 19870702; ZA 875147 A 19870714